WASHINGTON (AP) -- Dominant early, Stephen Strasburg fell apart after one of Ryan Zimmerman's two errors and wound up dropping his fifth consecutive decision, an 8-2 loss Saturday to the Chicago Cubs, whose starting pitcher, Edwin Jackson, worked into the sixth inning and hit a two-run double for good measure. Jackson (1-5) retired 12 of Washington's first 13 batters and allowed two runs and four hits in 5 1-3 innings. He earned his first win under a $52 million, four-year contract he signed after leaving Washington as a free agent. Strasburg (1-5) set down Chicago's first 11 hitters, six via strikeout. But with two outs in the fifth, third baseman Zimmerman's off-target throw put a runner on. Turned out to be Strasburg's last inning, making for his shortest outing of 2013.